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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2531bd9895a5057c49701570a4294236fdb7e715744ef13cd13486c6ce0ae37' 
  AND token = 'co5/an3rzPSGgD5jBzyXDUnD4H8hSqNP9W6F1y3qQCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}